You can debug banners so you can finally figure out why that homebrew banner of yours isn't loading.
You better be interested in making custom banners because if not you just spent a whole lot of time on nothing but bragging rights.

If you are not a programmer, there's not much you can do with dev firmware. That and I believe you won't be able to access NNID/eShop while using dev firmware. So you stand to lose more then you gain from this if you aren't in a position to leverage the features dev firmware would give you.

I honestly didn't even know this existed. Was intrigued for a moment then I saw it was only for dev purposes and I realized that it was actually of no interest to me. I guess you get bragging rights, but the average user like me isn't going to be jealous if we already have A9LH with Luma.

By the way, since it's an unwritten rule of gbatemp that offtopic is tolerated and expected:

Despite Vista adding lots of controversial but effective security improvements, Windows security is still said by detractors to be bad... do you know why?
Because the exploit-based malware scene switched to a trojan-based ("deliberately" installed) one!

Given how many people have installed a whole alternative OS on their consoles without even knowing its features, no wonder people install simple programs linked by ads, huh?!